I don't "hate" her, but I remain disappointed to his day whenever I watch a season 7 episode.
Rumor has it that she requested being written out of the show, with the option to return for the finale. The bitter producers weren't having it, and made the decision to kill her off.
I think they could have easily sent Jadzia away on a war related mission, and had her check in once in a while. How hard could it have been to film 2-3 bits featuring her face that Worf or Sisko could talk to for 30 seconds on a view screen?